CN101896792A - Field device for process instrumentation - Google Patents
Field device for process instrumentation Download PDFInfo
- Publication number
- CN101896792A CN101896792A CN2008801202060A CN200880120206A CN101896792A CN 101896792 A CN101896792 A CN 101896792A CN 2008801202060 A CN2008801202060 A CN 2008801202060A CN 200880120206 A CN200880120206 A CN 200880120206A CN 101896792 A CN101896792 A CN 101896792A
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- CN
- China
- Prior art keywords
- signal
- output
- computing unit
- controller
- simulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000005259 measurement Methods 0.000 claims description 18
- 238000004088 simulation Methods 0.000 claims description 13
- 230000007257 malfunction Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 241000931705 Cicada Species 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0224—Process history based detection method, e.g. whereby history implies the availability of large amounts of data
- G05B23/0227—Qualitative history assessment, whereby the type of data acted upon, e.g. waveforms, images or patterns, is not relevant, e.g. rule based assessment; if-then decisions
- G05B23/0235—Qualitative history assessment, whereby the type of data acted upon, e.g. waveforms, images or patterns, is not relevant, e.g. rule based assessment; if-then decisions based on a comparison with predetermined threshold or range, e.g. "classical methods", carried out during normal operation; threshold adaptation or choice; when or how to compare with the threshold
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
- G01D3/036—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure on measuring arrangements themselves
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Testing And Monitoring For Control Systems (AREA)
- Programmable Controllers (AREA)
Abstract
The invention relates to a field device for process instrumentation, in particular a measuring transducer (1), comprising an analogue output (10, 11), to which a two-wire line (8, 9) can be connected for transmitting an analogue output signal (20). The output circuit contains a controller (14) with an actuator (12) connected downstream for the output signal (20). To monitor the output circuit for the correct setting of the loop current, a unit (17) monitors whether an actuating signal (16) remains within a predeterminable value range. If the actuating signal (16) is outside said value range, an indicator signal (18) is output to a processing unit (5) so that suitable measures can be introduced in response to an error state that has thus been identified.
Description
Technical field
The present invention relates to a kind of as described in the preamble, field apparatus of being used for process instrumentation according to claim 1, particularly a kind of measurement translator, it has analog output, can connect the output signal two-wire system circuit that is used for transportation simulator thereon.
Background technology
The field apparatus that often is used for process instrumentation in automatic technology, they for example are used for detecting and/or the influence process variable, and are connected with each other by a kind of automated network that is used for swap data.Field apparatus detects parameter physics or chemistry as process variable, these field apparatuss usually are called measurement translator, and this is to be used for further processing because they become these parameter transformations a measured value also this measured value for example to be exported to higher level's control station or exported controller to as actual value respectively.The example of the measurement translator of this pattern is useful on measurement translator liquid level, mass flow ratio, pressure, temperature, PH-value, electric conductivity etc.
By a kind of measurement translator of EP 1192614B1 cicada, it converts measurement parameter physics or chemistry to the output signal of the simulation that is consistent with measured value, can transmit on the two-wire system circuit.Be provided with right sensors, the D/A that connects in the downstream that is used for measurement parameter this physics or chemistry, the computing unit that is arranged on this D/A downstream and by this computing unit output circuit control, that can be connected to the two-wire system circuit for this reason.Sensor converts measurement parameter to sensor signal, this sensor signal is digitized in D/A, and in computing unit, be processed into ratings, utilize this ratings the output signal of the simulation on the two-wire system circuit to be regulated by the regulating device in the output circuit.Ratings as the numeral of electric current prevalue is at first utilized D/A to be converted into the current rating of simulation in output circuit, and is converted into the loop current of simulation by ensuing control circuit.The actual value of loop current is used for the measuring sensor of current/voltage-converted and surveys.For this reason, low ohm current measurement resistance (it is also referred to as shunt) can be used as simple measuring sensor and uses.Consequent, be fed to comparison means with the proportional voltage signal of actual value of loop current, to be used for forming control deviation by the current rating of simulation with by the actual value of loop current.According to control deviation, determined to be used for the execution signal of topworks for control deviation is controlled as analog controller, the controller that utilizes integrated operational amplifier to realize, this topworks is formed by the transistor circuit that is used for the regulating loop electric current.Simultaneously, the actual value of the simulation that measures of loop current is come digitizing by means of D/A, and flows to computing unit as the actual value of numeral.Therefore the deviation between the computing unit actual value that can be determined at numeral and the digital ratings, and by the corresponding tracking to ratings this is reacted.If unallowed large deviation, then it is notified to the user of field apparatus.This can realize by data-interface and/or indicating device, and data-interface and/or indicating device are used to transmit or indicate about the information of the deviation measured and and then about measuring wrong information.Data-interface is the ingredient of output circuit, and can carry out data communication by the two-wire system circuit according to the HART-agreement.
Summary of the invention
The objective of the invention is to, a kind of field apparatus that is used for process instrumentation is proposed, it has analog output, the two-wire system circuit that on this analog output, can connect the output signal that is used for transportation simulator, wherein can utilize especially simple device to come loop current is monitored, and the controller that is used for loop current or the fault of topworks are surveyed.
In order to realize this purpose, the novel field apparatus that starts described type has in the feature described in the characteristic of claim 1.Favourable improvement project of the present invention has been described in the dependent claims.
The invention has the advantages that, the monitoring of the controller that is used for loop current and topworks is only needed the input of few especially circuit design aspect.The monitoring whether the execution signal is remained within the predeterminable numerical range can utilize comparer to realize in simple especially mode, and whether this comparer detects continuously, promptly carry out signal and be within the predeterminable range of signal.In the physical boundaries of considering controller output signal with consider under the situation of the realization aspect the circuit engineering separately of topworks, range of signal is preset.Carry out signal advantageously with direct mode and control deviation close association, and be typicalness for the characteristic of the control of loop current.Can be fast and by means of the indicator signal that is produced by this way reliably with fault status signalization.
Apparently, monitor to carry out and interchangeablely the signal be for using independent comparer, to carry out signal and transfer to computing unit by D/A as digitized numerical value, this computing unit has been born whether remaining within the predeterminable numerical range of the task of monitoring subsequently.
In a special design proposal, controller can be designed as the PI-controller, and this controller has produced proportional parts and the integral part of regulating parameter according to control deviation.When using the PI-controller, integral part has caused, during lasting control deviation, carries out signal and enters into the upper limit or the lower limit of carrying out signal in the mode that is similar to ramp function.When using operational amplifier and realize controller, this boundary is approximately corresponding to the supply voltage of operational amplifier.Can identify the persistent fault of the control of loop current so reliably.
In another favourable design proposal, comparer can be designed for the generation indicator signal, and this indicator signal can be transported to computing unit, so that malfunction is further handled.In computing unit, can carry out analysis with time correlation to indicator signal, thus for example when sudden variation takes place in the ratings that provides in the control in loop current, can expect in control moment effect decay so that avoid error analysis.Because the ratings curve separately of computing unit is known, therefore can select monitoring type by computing unit according to the ratings curve.
If based on to carrying out the monitoring of signal, determined the fault of controller or topworks by computing unit, it begins to adopt suitable measure to come fault is handled immediately so.This for example can be: the information that failure message is maybe needed safeguard sends to higher level's control station by the two-wire system circuit; And/or make field apparatus enter safe mode.
Description of drawings
One embodiment of the present of invention shown in the drawings are described in detail the present invention and design proposal and advantage with reference to the accompanying drawings.
Embodiment
Accompanying drawing shows the structure of the principle of measurement translator 1, and this measurement translator is suitable for being applied in the automation device, thereby detects parameter chemistry or physics.Parameter 2 chemistry or physics is directed to sensor 3, and this sensor becomes electric signal with this parameter transformation.The measuring-signal of the simulation of Chan Shenging utilizes D/A 4 digitizings like this, and is fed to computing unit 5, and in this computing unit, measuring-signal is obtaining correction aspect linear and the temperature characterisitic.The prevalue of the numeral of the loop current that is consistent with measured value, calculate by computing unit 5, be converted into the ratings 7 of the simulation of loop current by means of the D/A 6 that connects in the downstream, and be fed to control circuit to be used to regulate two-wire system circuit 8, loop current 20 in 9, measurement translator 1 are connected on this two-wire system circuit.Input end interface 10 and output terminal interface 11 are used for measurement translator 1 is connected on the two-wire system circuit 8,9.Loop current 20 flow through input end interface 10, topworks 12, be used to measure the shunt 13 and the output terminal interface 11 of loop current.Topworks 12 can be made of transistor in simple mode, has been guided as the control voltage of carrying out signal 16 by the controller 14 that is designed to operational amplifier on this transistor.Shunt 13 is realized by precision resistance.Descend by shunt 13, be transferred back comparison means 15 with loop current 20 proportional voltages 19, and from the ratings 7 of loop current, deduct there, in order to definite control deviation 21.Controller 14 receives the control deviation 21 as input parameter, and calculate proportional parts and integral part corresponding to its controlled variable thus, this controlled variable is for example regulated in advance by means of resistance and capacitor suitable dimensions size in the circuit of operational amplifier is arranged.Under normal circumstances, the actual value 19 of the measurement of loop current 20 that is to say when can be traced back to its ratings 7, control deviation 21 disappears after possible moment effect decay, and the execution signal 16 on the output terminal of controller 14 is retained within the default boundary.If yet in topworks, particularly break down at controller 14 or in topworks 12, this has in most of the cases directly caused so, carry out signal 16 and left default numerical range.This utilization is used for monitoring the device 17 of carrying out signal to be determined, when having left default numerical range, this device sends and is used in reference to the indicator signal 18 that malfunction is shown and gives computing unit 5.The fault that identifies like this can be by measurement translator 1 the suitable control of indicating member (it is not shown for simple and clear reason in the accompanying drawings) be notified to the operator, or be notified to higher level's control station in the automation device by two-wire system circuit 8,9.By this way, can realize the monitoring of the assembly in the output circuit of measurement translator 1 with relatively low input.
In shown embodiment, measurement translator is interpreted as field apparatus.Apparently, the present invention also can be applicable in the field apparatus of other type with analog output, for example for as the topworks of operation valve or have the Programmable Logic Controller of simulation output precision, it for example is suitable for connecting topworks by the two-wire system circuit.
Claims (3)
1. field apparatus that is used for process instrumentation, particularly a kind of measurement translator (1) has:
-analog output (10,11), the two-wire system circuit (8,9) that on described analog output, can connect the output signal (20) that is used for transportation simulator with;
-computing unit (5) is by the exportable digital value that is consistent with the output signal of described simulation of described computing unit;
-be connected the D/A (6) in the downstream of described computing unit (5), be used for described digital value is converted to the ratings (7) of the simulation of described output signal;
-comparison means (15) is used for forming control deviation (21) by described ratings (7) with by actual value output signal, that measure (19) of described simulation on described output terminal;
-controller (14) is used for producing and carries out signal (16) so that described control deviation is controlled; With
-topworks (12) is used for adjusting according to described execution signal (16) output signal of described simulation,
It is characterized in that, have a device (17), be used for whether described execution signal remained on and monitor within the predeterminable numerical range and be used for when leaving described numerical range, producing indicator signal (18).
2. field apparatus according to claim 1 is characterized in that, described controller (14) is designed to the PI-controller.
3. field apparatus according to claim 1 and 2, it is characterized in that, be provided with the comparer (17) that is used to produce described indicator signal (18), and described indicator signal is delivered to described computing unit (5), when leaving described numerical range the malfunction that identifies is further handled with box lunch.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007059847A DE102007059847A1 (en) | 2007-12-12 | 2007-12-12 | Field device for process instrumentation |
| DE102007059847.7 | 2007-12-12 | ||
| PCT/EP2008/067451 WO2009074681A2 (en) | 2007-12-12 | 2008-12-12 | Field device for process instrumentation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101896792A true CN101896792A (en) | 2010-11-24 |
| CN101896792B CN101896792B (en) | 2012-06-20 |
Family
ID=40679863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008801202060A Expired - Fee Related CN101896792B (en) | 2007-12-12 | 2008-12-12 | Field device for process instrumentation |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8825422B2 (en) |
| EP (1) | EP2220460B1 (en) |
| CN (1) | CN101896792B (en) |
| DE (1) | DE102007059847A1 (en) |
| WO (1) | WO2009074681A2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454485A (en) * | 2012-05-29 | 2013-12-18 | 罗斯蒙德公司 | Process control loop current verification |
| CN104142161A (en) * | 2014-07-31 | 2014-11-12 | 天津二十冶建设有限公司 | Quick debugging method for thermal meter on construction site |
| CN106052721A (en) * | 2015-04-01 | 2016-10-26 | 克洛纳测量技术有限公司 | Method for operating a field device and corresponding field device |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008020862B3 (en) * | 2008-04-25 | 2009-05-14 | Siemens Aktiengesellschaft | Measuring transducer for detecting e.g. temperature of medium, has switch, resistor, analog-to-digital converter and microcontroller monitoring status of sensors by which PN-transition is shiftable in trial operation in conducting direction |
| DE102009034419B4 (en) * | 2009-07-23 | 2016-09-29 | Siemens Aktiengesellschaft | Field device for process instrumentation |
| DE102009050645A1 (en) * | 2009-10-26 | 2011-04-28 | Siemens Aktiengesellschaft | Field device for process instrumentation |
| DE102011082018A1 (en) | 2011-09-01 | 2013-03-07 | Siemens Aktiengesellschaft | Method for operating a field instrument for process instrumentation and field device |
| DE102011087157B4 (en) * | 2011-11-25 | 2015-10-15 | Siemens Aktiengesellschaft | Process automation device |
| US10809687B2 (en) * | 2014-09-30 | 2020-10-20 | Emerson Process Management Lllp. | Field device with self-recovery |
| US10082784B2 (en) * | 2015-03-30 | 2018-09-25 | Rosemount Inc. | Saturation-controlled loop current regulator |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1342722A (en) * | 1970-01-16 | 1974-01-03 | Honeywell Ltd | Control circuits for use in control systems |
| US4783659A (en) * | 1986-08-22 | 1988-11-08 | Rosemount Inc. | Analog transducer circuit with digital control |
| DE4015042A1 (en) * | 1990-05-10 | 1991-11-14 | Siemens Ag | DEVICE FOR ANALOG-DIGITAL CONVERTING A MEASURING SIZE PRODUCED BY SENSORS ARRANGED IN BRIDGE CIRCUIT, IN PARTICULAR OF STRETCH MEASUREMENT STRIPS IN A WEIGHT CELL |
| FI111106B (en) * | 1999-02-19 | 2003-05-30 | Neles Controls Oy | Procedure for setting a process control loop in an industrial process |
| US6445962B1 (en) * | 1999-03-15 | 2002-09-03 | Fisher Rosemount Systems, Inc. | Auto-tuning in a distributed process control environment |
| DE19930661A1 (en) * | 1999-07-02 | 2001-01-18 | Siemens Ag | Transmitter |
| DE10146949A1 (en) * | 2000-11-22 | 2002-06-06 | Continental Teves Ag & Co Ohg | Active magnetic sensor for electronic brake systems |
| DE10202028A1 (en) * | 2002-01-18 | 2003-07-24 | Endress & Hauser Gmbh & Co Kg | Transmitter for detecting a physical measured variable and for converting it into an electrical variable uses signal processors to reshape the electrical variable into a test signal |
| US6725182B2 (en) * | 2002-07-31 | 2004-04-20 | Smar Research Corporation | System and method for monitoring devices and components |
| US7113890B2 (en) * | 2003-10-16 | 2006-09-26 | Abb Inc. | Method and apparatus for detecting faults in steam generator system components and other continuous processes |
-
2007
- 2007-12-12 DE DE102007059847A patent/DE102007059847A1/en not_active Ceased
-
2008
- 2008-12-12 EP EP08860820.3A patent/EP2220460B1/en not_active Not-in-force
- 2008-12-12 WO PCT/EP2008/067451 patent/WO2009074681A2/en active Application Filing
- 2008-12-12 US US12/747,489 patent/US8825422B2/en active Active
- 2008-12-12 CN CN2008801202060A patent/CN101896792B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454485A (en) * | 2012-05-29 | 2013-12-18 | 罗斯蒙德公司 | Process control loop current verification |
| CN103454485B (en) * | 2012-05-29 | 2016-04-06 | 罗斯蒙特公司 | Process control loop current verification |
| US9823276B2 (en) | 2012-05-29 | 2017-11-21 | Rosemount Inc. | Process control loop current verification |
| CN104142161A (en) * | 2014-07-31 | 2014-11-12 | 天津二十冶建设有限公司 | Quick debugging method for thermal meter on construction site |
| CN106052721A (en) * | 2015-04-01 | 2016-10-26 | 克洛纳测量技术有限公司 | Method for operating a field device and corresponding field device |
| CN106052721B (en) * | 2015-04-01 | 2021-09-21 | 克洛纳测量技术有限公司 | Method for operating a field device and corresponding field device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102007059847A1 (en) | 2009-06-18 |
| CN101896792B (en) | 2012-06-20 |
| WO2009074681A3 (en) | 2009-11-26 |
| US8825422B2 (en) | 2014-09-02 |
| EP2220460B1 (en) | 2015-07-29 |
| EP2220460A2 (en) | 2010-08-25 |
| WO2009074681A2 (en) | 2009-06-18 |
| US20100305896A1 (en) | 2010-12-02 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120620 |